From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint showing the design and specifications for a clutch damper spring drive.
| Identifier | ExFiles\Box 103\1\ scan0023 | |
| Date | 7th March 1933 | |
| Hs{Lord Ernest Hives - Chair} 784 "HAZO" RIVET OVER .360 DIA 1 BA 12 OFF < 22 1/2° SPRINGS - 16 OFF WIRE .092 MEAN RADIUS .150 4 WORKING COILS WITH 1/2 COIL SQUARE EACH END - SEMI OPEN ENDED FREE LENGTH .600 LOAD AT .550 TO BE 50 lbs FRICTION SETTING 50 lbs FT DRIVING PINS - 8 OFF SCALE 4/1 ROLLS-ROYCE, LTD PRINT ROOM MAR 7 1933 DERBY. G 53692 20/25 CLUTCH - DAMPER SPRING DRIVE | ||